This mounts on the armrest post on Storm3 models of electric wheelchair. - the armrest post is an odd shape so I needed to print a mount point.
This bracket takes a 19mm diameter tube (common 'towel rail' size tube) available from homeware / DIY stores. The 19mm tube has many accessories available, corner joints, end stops, clips etc so it's good for projects.
I used it for a cup holder, and an Android tablet holder.
The Wheelchair bracket has a hex nut holder internally (M4) so your chosen mount item can be locked in place with a bolt and (optional) thumbscrew knob.
WheelChair_Bracket.stl | 788.9KB |